One additional library to add, if you're working with scientific papers: https://github.com/kermitt2/grobid https://github.com/kermitt2/grobid. I use this with

One additional library to add, if you're working with scientific papers: https://github.com/kermitt2/grobid https://github.com/kermitt2/grobid. I use this with paperetl (https://github.com/neuml/paperetl https://github.com/neuml/paperetl).